Vacuum cleaner



FIG. 1 is a front perspective view of a vacuum cleaner showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a rear view thereof.

The broken line showing of the bottom regions of the vacuum cleaner is for environmental purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a vacuum cleaner, as shown and described. 